Every parent knows the moment: the shoes that fitted perfectly at the start of term are suddenly a struggle to put on. Knowing when kids outgrow shoes is partly about watching your child, and partly about knowing what to check. This guide covers what to look for, a simple check you can do at home, and how to plan purchases so you are not caught out in the busiest weeks of the school year.
This is general information. If you have concerns about how your child walks, their foot shape, or discomfort that does not go away, please speak to a paediatrician, podiatrist or orthotist.
Why feet grow fast in early years
Children's feet change a lot in the early years, and growth can come in bursts rather than at a steady pace. A pair that fits comfortably one month can feel tight a few months later. We do not quote exact growth figures here because they vary a lot from one child to another, and a clinician can tell you what to expect for your child.
What matters in practice is that children do not always tell you when a shoe is too small. Younger children may not have the words, and some children, including those with sensory differences or reduced sensation, may not notice or mention discomfort. That is why checking the shoe regularly is a kind habit rather than a nagging one.
Signs a shoe is too small or too tight
Look out for these signals:
- Red marks or pressure spots on the feet, toes or heels after taking shoes off
- Toes that curl or look squashed against the front of the shoe
- Reluctance to wear shoes, or taking them off at every chance
- Difficulty getting the shoe on, or the foot not seating fully
- The shoe looks distorted, with the upper bulging at the sides or the toe area stretched
- Changes in how your child walks, such as more tripping or tiring quickly (if you notice a persistent change, ask a professional)
A shoe can also be wrong in the other direction. If you see heel slipping in a child's shoe, so that the heel lifts out with each step, the shoe might be too big, too loose, or not fastened well. Check how the shoe is closed first, then check the size. For shoes with zippers and laces, make sure the laces are adjusted and the zipper is fully closed.
Checking with a thumb width and the insole
Two quick checks you can do at home:
The thumb check
With your child standing in their shoes, press gently at the front to feel where the longest toe is. There should be some space, and a common rule of thumb is about the width of your thumb. This is a rough guide only, and the right amount depends on the shoe style and your child. Do it when your child is standing, because the foot moves forward when the child puts weight on it.
The insole check
If the insole is removable, take it out and stand your child on it with the heel at the back. Look at whether the toes or the sides of the foot reach past the edges. If they do, the shoe is likely to be too small or too narrow. Then put the insole back and check the fit again with the shoe on.
For a more careful check, measure the foot using our guide to measuring your child's foot at home, and compare the result with our size guide.
Extra room with removable insoles
Many BILLY Footwear styles have removable insoles, and some product pages describe two 3 mm removable insoles that allow depth adjustability. Taking out an insole can give a little extra room for volume, for example when feet feel a bit puffy or when a child uses an orthotic. It is not a way to stretch a size that is clearly too small. If your child uses a brace or orthotic, discuss any change with your orthotist, and read our post on how to size adaptive footwear with confidence.
Always check the product page of the style you are interested in, as insole details differ from model to model.
Plan sizes around school terms
You cannot predict your child's growth exactly, but you can plan around the calendar.
- Check shoes at the start of each term. A simple look and a thumb check before school begins can save a mid-term rush.
- Keep a note of your child's size and the date. Next time, you will know how long the last pair lasted.
- Do not buy far in advance. A shoe bought many months before it is needed may not fit when the day comes.
- Think about the shoes for sports days and uniform. If your child needs a different pair for PE or events, plan them at the same time.
- Order early. Back-to-school periods are busy, so allow time for sizing questions.
Because every child grows differently, there is no single schedule for replacing shoes. Checking regularly is more reliable than following a fixed number of months.
Frequently asked questions
How often should I check my child's shoe size?
There is no one answer. Many families check at the start of each term and whenever the shoes look tight or the child complains. If your child has a condition affecting the feet, ask your clinician how often to review.
Is a shoe that slips at the heel too big?
Not always. Heel slipping can come from the size, the fastening or the shape of the shoe. Check that the shoe is fully closed and adjusted first. If it still slips, message us or ask your podiatrist.
Can I buy a bigger size so my child can grow into it?
It is tempting, but shoes that are too big can feel unstable and cause rubbing. It is usually better to choose the right size now and review again soon.
Need a hand choosing the next size?
If you are not sure which size comes next, message us on WhatsApp with your child's foot length and the style you have in mind, and we will help. You can also browse our kids' collection. Unworn items can be returned within 14 days of delivery.